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  <title>9 ggplot2 | Tidy evaluation</title>
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<meta name="author" content="Lionel Henry" />
<meta name="author" content="Hadley Wickham" />
<meta name="author" content="王诗翔（译）" />



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<li><strong><a href="./">Tidy evaluation</a></strong></li>

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<li class="chapter" data-level="" data-path="index.html"><a href="index.html"><i class="fa fa-check"></i>欢迎</a><ul>
<li class="chapter" data-level="" data-path="index.html"><a href="index.html#e585b6e4bb96e8b584e6ba90"><i class="fa fa-check"></i>其他资源</a></li>
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<li class="part"><span><b>I 原理</b></span></li>
<li class="chapter" data-level="1" data-path="section-1.html"><a href="section-1.html"><i class="fa fa-check"></i><b>1</b> 介绍</a></li>
<li class="chapter" data-level="2" data-path="sec-why-how.html"><a href="sec-why-how.html"><i class="fa fa-check"></i><b>2</b> 为什么使用以及怎么使用</a><ul>
<li class="chapter" data-level="2.1" data-path="sec-why-how.html"><a href="sec-why-how.html#section-2.1"><i class="fa fa-check"></i><b>2.1</b> 数据隐藏</a></li>
<li class="chapter" data-level="2.2" data-path="sec-why-how.html"><a href="sec-why-how.html#section-2.2"><i class="fa fa-check"></i><b>2.2</b> 引用代码</a></li>
<li class="chapter" data-level="2.3" data-path="sec-why-how.html"><a href="sec-why-how.html#section-2.3"><i class="fa fa-check"></i><b>2.3</b> 去引用代码</a></li>
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<li class="chapter" data-level="3" data-path="sec-do-you-need.html"><a href="sec-do-you-need.html"><i class="fa fa-check"></i><b>3</b> 你需要 tidy eval 吗？</a><ul>
<li class="chapter" data-level="3.1" data-path="sec-do-you-need.html"><a href="sec-do-you-need.html#sec:fixed-colnames"><i class="fa fa-check"></i><b>3.1</b> 固定列名</a></li>
<li class="chapter" data-level="3.2" data-path="sec-do-you-need.html"><a href="sec-do-you-need.html#sec:automating-loops"><i class="fa fa-check"></i><b>3.2</b> 自动循环</a><ul>
<li class="chapter" data-level="3.2.1" data-path="sec-do-you-need.html"><a href="sec-do-you-need.html#dplyr-"><i class="fa fa-check"></i><b>3.2.1</b> dplyr 中的向量化</a></li>
<li class="chapter" data-level="3.2.2" data-path="sec-do-you-need.html"><a href="sec-do-you-need.html#section-3.2.2"><i class="fa fa-check"></i><b>3.2.2</b> 按列循环</a></li>
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<li class="chapter" data-level="4" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html"><i class="fa fa-check"></i><b>4</b> 加速</a><ul>
<li class="chapter" data-level="4.1" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html#section-4.1"><i class="fa fa-check"></i><b>4.1</b> 编写函数</a><ul>
<li class="chapter" data-level="4.1.1" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html#section-4.1.1"><i class="fa fa-check"></i><b>4.1.1</b> 减少重复</a></li>
<li class="chapter" data-level="4.1.2" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html#section-4.1.2"><i class="fa fa-check"></i><b>4.1.2</b> 引用函数的特殊之处在哪？</a></li>
<li class="chapter" data-level="4.1.3" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html#section-4.1.3"><i class="fa fa-check"></i><b>4.1.3</b> 去引用</a></li>
<li class="chapter" data-level="4.1.4" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html#-qq_show-"><i class="fa fa-check"></i><b>4.1.4</b> 通过 <code>qq_show()</code> 理解 <code>!!</code></a></li>
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<li class="chapter" data-level="4.2" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html#section-4.2"><i class="fa fa-check"></i><b>4.2</b> 引用和去引用</a><ul>
<li class="chapter" data-level="4.2.1" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html#section-4.2.1"><i class="fa fa-check"></i><b>4.2.1</b> 第一步：抽取</a></li>
<li class="chapter" data-level="4.2.2" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html#section-4.2.2"><i class="fa fa-check"></i><b>4.2.2</b> 第二步：引用</a></li>
<li class="chapter" data-level="4.2.3" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html#section-4.2.3"><i class="fa fa-check"></i><b>4.2.3</b> 第三步：去引用</a></li>
<li class="chapter" data-level="4.2.4" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html#section-4.2.4"><i class="fa fa-check"></i><b>4.2.4</b> 结果</a></li>
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<li class="chapter" data-level="4.3" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html#section-4.3"><i class="fa fa-check"></i><b>4.3</b> 用字符串取代引用</a><ul>
<li class="chapter" data-level="4.3.1" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html#section-4.3.1"><i class="fa fa-check"></i><b>4.3.1</b> 字符串</a></li>
<li class="chapter" data-level="4.3.2" data-path="sec-up-to-speed.html"><a href="sec-up-to-speed.html#section-4.3.2"><i class="fa fa-check"></i><b>4.3.2</b> 包含列名的字符串向量</a></li>
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<li class="chapter" data-level="5" data-path="multiple.html"><a href="multiple.html"><i class="fa fa-check"></i><b>5</b> Dealing with multiple arguments</a><ul>
<li class="chapter" data-level="5.1" data-path="multiple.html"><a href="multiple.html#the-...-argument"><i class="fa fa-check"></i><b>5.1</b> The <code>...</code> argument</a></li>
<li class="chapter" data-level="5.2" data-path="multiple.html"><a href="multiple.html#simple-forwarding-of-..."><i class="fa fa-check"></i><b>5.2</b> Simple forwarding of <code>...</code></a></li>
<li class="chapter" data-level="5.3" data-path="multiple.html"><a href="multiple.html#quote-multiple-arguments"><i class="fa fa-check"></i><b>5.3</b> Quote multiple arguments</a></li>
<li class="chapter" data-level="5.4" data-path="multiple.html"><a href="multiple.html#unquote-multiple-arguments"><i class="fa fa-check"></i><b>5.4</b> Unquote multiple arguments</a></li>
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<li class="chapter" data-level="6" data-path="modifying-inputs.html"><a href="modifying-inputs.html"><i class="fa fa-check"></i><b>6</b> Modifying inputs</a><ul>
<li class="chapter" data-level="6.1" data-path="modifying-inputs.html"><a href="modifying-inputs.html#modifying-names"><i class="fa fa-check"></i><b>6.1</b> Modifying names</a><ul>
<li class="chapter" data-level="6.1.1" data-path="modifying-inputs.html"><a href="modifying-inputs.html#default-argument-names"><i class="fa fa-check"></i><b>6.1.1</b> Default argument names</a></li>
<li class="chapter" data-level="6.1.2" data-path="modifying-inputs.html"><a href="modifying-inputs.html#unquoting-argument-names"><i class="fa fa-check"></i><b>6.1.2</b> Unquoting argument names</a></li>
<li class="chapter" data-level="6.1.3" data-path="modifying-inputs.html"><a href="modifying-inputs.html#prefixing-quoted-arguments"><i class="fa fa-check"></i><b>6.1.3</b> Prefixing quoted arguments</a></li>
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<li class="chapter" data-level="6.2" data-path="modifying-inputs.html"><a href="modifying-inputs.html#modifying-quoted-expressions"><i class="fa fa-check"></i><b>6.2</b> Modifying quoted expressions</a><ul>
<li class="chapter" data-level="6.2.1" data-path="modifying-inputs.html"><a href="modifying-inputs.html#expanding-quoted-expressions-with-expr"><i class="fa fa-check"></i><b>6.2.1</b> Expanding quoted expressions with <code>expr()</code></a></li>
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</ul></li>
<li class="chapter" data-level="7" data-path="glossary.html"><a href="glossary.html"><i class="fa fa-check"></i><b>7</b> Glossary</a><ul>
<li class="chapter" data-level="7.1" data-path="glossary.html"><a href="glossary.html#data-structures"><i class="fa fa-check"></i><b>7.1</b> Data structures</a><ul>
<li class="chapter" data-level="7.1.1" data-path="glossary.html"><a href="glossary.html#glossary-data-mask"><i class="fa fa-check"></i><b>7.1.1</b> TODO Data mask</a></li>
<li class="chapter" data-level="7.1.2" data-path="glossary.html"><a href="glossary.html#glossary-expr"><i class="fa fa-check"></i><b>7.1.2</b> Expression</a></li>
<li class="chapter" data-level="7.1.3" data-path="glossary.html"><a href="glossary.html#expression-base"><i class="fa fa-check"></i><b>7.1.3</b> Expression (base)</a></li>
<li class="chapter" data-level="7.1.4" data-path="glossary.html"><a href="glossary.html#glossary-sym"><i class="fa fa-check"></i><b>7.1.4</b> TODO Symbol</a></li>
</ul></li>
<li class="chapter" data-level="7.2" data-path="glossary.html"><a href="glossary.html#programming-concepts"><i class="fa fa-check"></i><b>7.2</b> Programming Concepts</a><ul>
<li class="chapter" data-level="7.2.1" data-path="glossary.html"><a href="glossary.html#glossary-constant-symbolic"><i class="fa fa-check"></i><b>7.2.1</b> Constant versus symbolic</a></li>
<li class="chapter" data-level="7.2.2" data-path="glossary.html"><a href="glossary.html#glossary-nse"><i class="fa fa-check"></i><b>7.2.2</b> TODO Non-Standard Evaluation (NSE)</a></li>
<li class="chapter" data-level="7.2.3" data-path="glossary.html"><a href="glossary.html#glossary-quotation-evaluation"><i class="fa fa-check"></i><b>7.2.3</b> TODO Quotation versus Evaluation</a></li>
<li class="chapter" data-level="7.2.4" data-path="glossary.html"><a href="glossary.html#glossary-qq"><i class="fa fa-check"></i><b>7.2.4</b> TODO Quasiquotation</a></li>
<li class="chapter" data-level="7.2.5" data-path="glossary.html"><a href="glossary.html#glossary-parse"><i class="fa fa-check"></i><b>7.2.5</b> TODO Parsing</a></li>
<li class="chapter" data-level="7.2.6" data-path="glossary.html"><a href="glossary.html#glossary-metaprogramming"><i class="fa fa-check"></i><b>7.2.6</b> TODO Metaprogramming</a></li>
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</ul></li>
<li class="part"><span><b>II Cookbooks</b></span></li>
<li class="chapter" data-level="8" data-path="dplyr.html"><a href="dplyr.html"><i class="fa fa-check"></i><b>8</b> dplyr</a><ul>
<li class="chapter" data-level="8.1" data-path="dplyr.html"><a href="dplyr.html#patterns-for-single-arguments"><i class="fa fa-check"></i><b>8.1</b> Patterns for single arguments</a><ul>
<li class="chapter" data-level="8.1.1" data-path="dplyr.html"><a href="dplyr.html#enquo-and---quote-and-unquote-arguments"><i class="fa fa-check"></i><b>8.1.1</b> <code>enquo()</code> and <code>!!</code> - Quote and unquote arguments</a></li>
<li class="chapter" data-level="8.1.2" data-path="dplyr.html"><a href="dplyr.html#quo_name---create-default-column-names"><i class="fa fa-check"></i><b>8.1.2</b> <code>quo_name()</code> - Create default column names</a></li>
<li class="chapter" data-level="8.1.3" data-path="dplyr.html"><a href="dplyr.html#and---unquote-column-names"><i class="fa fa-check"></i><b>8.1.3</b> <code>:=</code> and <code>!!</code> - Unquote column names</a></li>
</ul></li>
<li class="chapter" data-level="8.2" data-path="dplyr.html"><a href="dplyr.html#patterns-for-multiple-arguments"><i class="fa fa-check"></i><b>8.2</b> Patterns for multiple arguments</a><ul>
<li class="chapter" data-level="8.2.1" data-path="dplyr.html"><a href="dplyr.html#forward-multiple-arguments"><i class="fa fa-check"></i><b>8.2.1</b> <code>...</code> - Forward multiple arguments</a></li>
<li class="chapter" data-level="8.2.2" data-path="dplyr.html"><a href="dplyr.html#enquos-and---quote-and-unquote-multiple-arguments"><i class="fa fa-check"></i><b>8.2.2</b> <code>enquos()</code> and <code>!!!</code> - Quote and unquote multiple arguments</a></li>
<li class="chapter" data-level="8.2.3" data-path="dplyr.html"><a href="dplyr.html#expr---modify-quoted-arguments"><i class="fa fa-check"></i><b>8.2.3</b> <code>expr()</code> - Modify quoted arguments</a></li>
<li class="chapter" data-level="8.2.4" data-path="dplyr.html"><a href="dplyr.html#sec:external-quoting"><i class="fa fa-check"></i><b>8.2.4</b> <code>vars()</code> - Quote multiple arguments externally</a></li>
<li class="chapter" data-level="8.2.5" data-path="dplyr.html"><a href="dplyr.html#enquos.named-true---automatically-add-default-names"><i class="fa fa-check"></i><b>8.2.5</b> <code>enquos(.named = TRUE)</code> - Automatically add default names</a></li>
<li class="chapter" data-level="8.2.6" data-path="dplyr.html"><a href="dplyr.html#quos_auto_name---manually-add-default-names"><i class="fa fa-check"></i><b>8.2.6</b> <code>quos_auto_name()</code> - Manually add default names</a></li>
</ul></li>
<li class="chapter" data-level="8.3" data-path="dplyr.html"><a href="dplyr.html#select"><i class="fa fa-check"></i><b>8.3</b> <code>select()</code></a></li>
<li class="chapter" data-level="8.4" data-path="dplyr.html"><a href="dplyr.html#filter"><i class="fa fa-check"></i><b>8.4</b> <code>filter()</code></a></li>
<li class="chapter" data-level="8.5" data-path="dplyr.html"><a href="dplyr.html#case_when"><i class="fa fa-check"></i><b>8.5</b> <code>case_when()</code></a></li>
<li class="chapter" data-level="8.6" data-path="dplyr.html"><a href="dplyr.html#gotchas"><i class="fa fa-check"></i><b>8.6</b> Gotchas</a><ul>
<li class="chapter" data-level="8.6.1" data-path="dplyr.html"><a href="dplyr.html#nested-quoting-functions"><i class="fa fa-check"></i><b>8.6.1</b> Nested quoting functions</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="9" data-path="ggplot2.html"><a href="ggplot2.html"><i class="fa fa-check"></i><b>9</b> ggplot2</a></li>
<li class="part"><span><b>III Going further</b></span></li>
<li class="chapter" data-level="10" data-path="a-rich-toolbox.html"><a href="a-rich-toolbox.html"><i class="fa fa-check"></i><b>10</b> A rich toolbox</a><ul>
<li class="chapter" data-level="10.1" data-path="a-rich-toolbox.html"><a href="a-rich-toolbox.html#todo-quote-expr-and-enexpr"><i class="fa fa-check"></i><b>10.1</b> TODO <code>quote()</code>, <code>expr()</code> and <code>enexpr()</code></a></li>
<li class="chapter" data-level="10.2" data-path="a-rich-toolbox.html"><a href="a-rich-toolbox.html#todo-quo-and-enquo"><i class="fa fa-check"></i><b>10.2</b> TODO <code>quo()</code> and <code>enquo()</code></a></li>
<li class="chapter" data-level="10.3" data-path="a-rich-toolbox.html"><a href="a-rich-toolbox.html#todo-vars-quos-and-enquos"><i class="fa fa-check"></i><b>10.3</b> TODO <code>vars()</code>, <code>quos()</code> and <code>enquos()</code></a></li>
<li class="chapter" data-level="10.4" data-path="a-rich-toolbox.html"><a href="a-rich-toolbox.html#toolbox-qq-show"><i class="fa fa-check"></i><b>10.4</b> TODO <code>qq_show()</code></a></li>
<li class="chapter" data-level="10.5" data-path="a-rich-toolbox.html"><a href="a-rich-toolbox.html#todo-sym-and-syms"><i class="fa fa-check"></i><b>10.5</b> TODO <code>sym()</code> and <code>syms()</code></a></li>
</ul></li>
<li class="chapter" data-level="11" data-path="creating-grammars.html"><a href="creating-grammars.html"><i class="fa fa-check"></i><b>11</b> Creating grammars</a></li>
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